A fogger is a solution, I have personally never tried one myself. I live in an area where I have really extreme humidity changes in my house (80-20% summer/winter) I have been using substrate to control it. I use eco earth which is a coconut hust ground up really fine. In the winter I'll mix loose coco with water to raise the humidity and in the summer use it completely dry to lower it some (de humidifier is needed too however) That works for me.

Did you try to place the fogger on a timer so it only comes on for 30 min in the morning and in the evening? That might work with your set up.
Alex